// 展开全文
const showbtn=document.querySelector('.show_btn');
showbtn.onclick=function(){
    (function showdiv(obj) {
        var x = obj.parentNode;  
        var y = x.nextSibling;
        if(y.nodeType != 1){  
            y = y.nextSibling;  
        }
        y.style.display = "block";  
        x.style.display = "none";  
    })(this)
}


// 收起全文 
const hidebtn=document.querySelector('.hidden_btn');
hidebtn.onclick=function(){
    (function hidediv(obj) {
        var y = obj.parentNode;  
        var x = y.previousSibling;  
        if(x.nodeType != 1){
            x = x.previousSibling;  
        }  
        y.style.display = "none";
        x.style.display = "block";
    })(this)
}
